June weather forecast
Grantham, Jamaica

June, the first month of the summer in Grantham, is still a hot month, with an average temperature fluctuating between 23°C (73.4°F) and 30.8°C (87.4°F).

Temperature

Grantham's weather in June, with an average high-temperature of a still tropical 30.8°C (87.4°F), subtly shifts from May's 30.3°C (86.5°F). Grantham's average low-temperature during June nights is observed to be a warm 23°C (73.4°F).

Heat index

For June, the heat index is computed to be a blistering 40°C (104°F). Undertake additional safety actions, risk of heat cramps and heat exhaustion is significant. Persistent activity may induce heatstroke.
Heat index details are generally centered around shaded locations and a mild breeze. The heat index could experience an increase of 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'feels like' or 'real feel', is a fusion of air temperature and moisture levels to demonstrate the sensation of heat. The influence of weather is personal, with varied individuals experiencing it differently due to differences in body mass, stature, and physical exertion levels. Direct exposure to the sun's rays can enhance the felt temperature, increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular importance for children. Typically, young kids are at a higher risk than adults since they sweat less. Also, the larger skin surface in proportion to their small bodies and the heightened heat production due to their active nature adds to their vulnerability.
The human body has a built-in cooling mechanism through perspiration; evaporating sweat dissipates the excess heat. With a lot of moisture in the air, the evaporation process is not as effective, and the body does not cool down as efficiently, creating a perception of overheating. Overheating can ensue when the body accumulates more heat than it can release, and dehydration severity may vary.

Humidity

In Grantham, Jamaica, the average relative humidity in June is 79%.

Rainfall

In Grantham, in June, it is raining for 20.5 days, with typically 84mm (3.31") of accumulated precipitation. In Grantham, during the entire year, the rain falls for 265.1 days and collects up to 806mm (31.73") of precipitation.

Daylight

With an average of 13h and 12min of daylight, June has the longest days of the year.
On the first day of the month, sunrise is at 05:30 and sunset at 18:40. On the last day of June, in Grantham, sunrise is at 05:35 and sunset at 18:47 EST.

Sunshine

In June, the average sunshine in Grantham is 10.1h.

UV index

The months with the highest UV index in Grantham are May through August and October, with an average maximum UV index of 7. A UV Index of 6 to 7 symbolizes a high health hazard from unsafe exposure to UV radiation for average individuals.
Note: The maximum UV index of 7 during June leads to these instructions:
Undertake protective measures and comply with sun safety rules. Shielding against skin and eye damage is essential. During the period from 10 a.m. to 4 p.m., UV radiation is highest. Try to avoid direct sunlight during these hours. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat.